Irrational orientation relationship derived from rational orientation relationships using EBSD data

✍ Scribed by G. Nolze

• Book ID: 102811032
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 886 KB
• Volume: 43
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.200711058

✦ Synopsis

Abstract

The determination of the orientation relationship (OR) between α ‐Fe matrix (bcc) and γ ‐Fe precipitates (fcc) is discussed using orientation data collected by electron backscatter diffraction (EBSD). The comparatively low accuracy of EBSD is compensated by the high number of measurements what allows a general statement regarding to the mean OR existing in a sample. The representation and discussion is realized on a part of the Bain zone in a {001} pole figure. A discussion of some selected rational OR which are commonly used for the phase boundary characterization between α and γ shows that the pole figures describing a transformation from γ → α are different to those for α → γ. A technique is proposed based on at least three misorientation angles between the experimental OR to the rational OR's as reference. For the misorientation angle distribution a refinement is applied to extract the mean values. They are used to detect the mean OR, what is also possible for only a few or even a single precipitate if the number of measurements describing the phase boundary is sufficiently high. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)